let showPicker: boolean = false;

showPicker = true;

let age: number | string;

age = 112;
age = '113';

let userName: string = '11';

userName = "123";

let unUseable: void = undefined;

let list: Array<number> = [1, 3, 5, 7, 9];

enum Color {
  Red,

  Green,

  Blue,

  Black,

  White
}

let background: Color = Color.Black;

console.log(background);

type Name = string;

let s: Name = '111';

s = '13';

let a1: string = 'ae';

s = a1;